MEMBER FEATURE! Ash Plumbing & Heating Company is a licensed, family owned and operated heating, cooling, and plumbing company serving all of northern Warren County, parts of Sussex County and the surrounding areas. For over 30 years, we have established a strong reputation as a reliable and professional contractor. We can handle all of your plumbing, heating, and air conditioning needs. We also have a fully stocked retail plumbing and heating supply store located in Blairstown, New Jersey which caters to homeowners and contractors.